RESUMO
One of the surgical tactics and retrospective chart review of clinical cases are described for severe maxillo-mandibular discrepancy. The recently developed Le Fort I Halo distraction combined with mandibular sagittal splitting osteotomy is initially carried out simultaneously. Materials include six adult patients revealing severe jaw deformity with mandibular prognathism somehow ranging from 17-19 years of age. The required adjustment of the maxillo-mandibular discrepancy ranged from 14-23 mm to obtain the preferred occlusion. The simultaneous combination of over 10-mm maxillary Le Fort I Halo distraction with mandibular set-back secured rigidly by sagittal splitting was accomplished. The amount of mandibular set-back ranged from 4-6 mm. The amount of maxillary Le Fort I halo distraction ranged from 10-17 mm (Table I). The retention period of the halo brace was 21-22 days. In addition, the Delair type of face mask was used for 3-4 months as a night splint for consolidation after removal of the halo brace. Satisfactory maxillary distraction and mandibular set-back as planned preoperatively was obtained in all six cases. No particular postoperative complications were noticed. Compared with standard Le Fort I advancement for cleft patients, more advancement can be obtained easily with halo distration, particularly in cases where a large amount of advancement > 10 mm is required. This combination is worthwhile for a severe cleft jaw deformity, and is an alternative for standard double jaw osteotomy.
